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Block/Slow Apps while on Fail-Over (SD-WAN)

I successfully setup SD-WAN using Comcast (wan1) and an LTE router (wan2) in my lab environment.

How would you go about blocking or slowing certain apps like YouTube or Windows Update for example while you're in a failed over state? I may want to expand this to not allow the Guest VLAN to even use the wan2 connection, and subsequently giving the Voice VLAN priority.


My initial idea was to select the specific interface, but you can only select the 'virtual-wan-link' as an interface in the firewall policy. Do I have to go back to using link monitor so I can I have the individual interfaces back?


Thanks a bunch in advance!